The error code 550 will show when you don’t have any account logged via API (in case you have the USE ONLY EB on all your accounts), also, it will appear when you are using this option below and you have no accounts there or the accounts that you entered are not valid or have the USE ONLY EB checked.

So make sure that you have accounts logged via API or uncheck that option and see how it goes.

Great explanation @Luca, I wanted to add to what you said,
Even if you set this up correctly, for example, if you have 2 scrapers and 5 main accounts, you may get this error too as the scrapers may be busy scraping for other accounts. So make sure you have enough scrapers to keep up with the main accounts.

Hello,
I got a lot of positive feedback on my previous post, so i’m here with another one!
I’m going to show you guys an alternative method to setting up a scrapper account.
Some of you might already use this method, but based on what i’ve learned, and from talking to people on this forum, I figured that not everybody uses this method.
Disclaimer: this is how I personally set them up, it doesn’t mean that this is the only way to do it
I will cover the following:
-Setting up tag names.
-Ma…

the beauty of that option “when executing any tool…” is that you don’t need to set everything on the scrapper account you can just add all the sources and settings on the main account and make sure that you have some scrappers added to that option then star the tool, what Jarvee does is, for every API call that the main account need, the scrapper account will execute it, that way your main account will stay safe, also keep in mind what Hadi said about the number of scrapper, you need to have enough of them.

Did you add your follow sources on your main account or scrapper account?
If you add follow sources on your scrapper account, you need to uncheck this option from Settings > Social platforms > Instagram:

I have three scraper accounts all set up to use Full API Emulation. Two main accounts with 35 Follow sources set to use EB only. The main accounts work fine by themselves using API. If I set the Main accounts to use EB only, this is where the problems start. Since the update I haven’t seen the error 550 anymore, but now its telling me that all my sources are invalid… When they work if I don’t use @Hadi 's scraper method.

I was facing the same error message then realized that all the scrapers were in night mode.
I removed the night mode on one of the scrapers then immediate EMAIL CONFIRMATION loop (the one driving to the help page).